RBii vs. JPM vs. GP

[Marciano490]

I'm looking to purchase my first AP imminently, and I was hoping some of the cognoscenti here could help me out. I've narrowed my choices to the three above, all in gold, but am having trouble pinning down the exact size of each. I've tried on the Grand Prix, and know it's 44mm, but I've seen the Rubens and the Montoya listed anywhere from 42-46mm. I'm a large mammal, and definitely want at least 44mm, so if the other two do, in fact, clock in at 42mm, my agonizing decision would be much easier. Thanks to any of you fine folks who may have an answer, and I'll be sure to post my purchase next week.